Uredo cajani

Fungal Disease

Rust is a fungal disease affecting redgram, caused by Uredo cajani. It is distributed across countries like India, Sri Lanka, Kenya, Nigeria, and Jamaica, impacting redgram cultivation in tropical and subtropical regions. The disease is most severe during flowering and can lead to significant defoliation and yield loss under favorable conditions.

Epidemiology

• Favorable Conditions: Dense planting and canopy closure create a conducive microclimate.
• Weather Influence: Light rain, wind, and cloudiness promote spore release and dispersal.
• Critical Stage: Disease severity peaks with the onset of flowering.

Symptoms

• Leaf Pustules: Dark brown, raised pustules appear on the lower leaf surfaces, containing uredia.
• Defoliation: Infected leaves desiccate and drop off, leading to extensive defoliation during severe infections.

Early monitoring and maintaining proper plant spacing can help reduce disease development and minimize yield loss.